| http://www.w3.org/ns/prov#value | - In a preferred embodiment, antenna system 100 incorporates concentric, substantially overlapping quadrifilar helix antennas 20, 40 which are each fed by a single 90??? hybrid coupler 81, 91 (not shown in FIG. 1) to provide a physically small, cost effective antenna system capable of meeting the stringent gain, bandwidth, radiation pattern and other requirements of emerging cellular/satellite phone
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